GIA Diamonds and Diamond Grading Final Exam
#2 | Newest Questions and Answers | Updated
2026 | Complete Review
• Color . CORRECT ANSWER: How are gem-quality rough diamonds sorted?
• Baby Boomers . CORRECT ANSWER: What generation was first to connect with
diamonds as a representation of lifetime commitment?
• India . CORRECT ANSWER: Where did the diamond industry first start?
• Single-channel marketing . CORRECT ANSWER: What describes the concept of
centrally controlled supply, purchase, promotion, and sales of rough diamonds?
• Lower mantle . CORRECT ANSWER: What mantle layer is most dense?
• Will turn into graphite . CORRECT ANSWER: What happens to diamond if
lamproite stalls in the continental crust?
• When a continental and oceanic plate collide . CORRECT ANSWER: When does
subduction occur?
• High heat and high pressure . CORRECT ANSWER: How are metamorphic rocks
formed?
• CLIPPIR diamonds, blue diamonds, Brazil's Junia diamond . CORRECT ANSWER:
What is an example of a superdeep diamond?
,• A good sign that a pipe is nearby . CORRECT ANSWER: What might black spinel
in a mineral sample indicate?
• Robotic/automated crawlers . CORRECT ANSWER: What equipment might
offshore deep-sea diamond mining use?
• Primary deposits . CORRECT ANSWER: What deposit type produces most
diamonds mined today?
• Character sampling . CORRECT ANSWER: What type of sampling gives an initial
idea of diamond quality for a deposit?
• Brazil . CORRECT ANSWER: Where are rocks and geological structures similar to
Africa found due to ancient connections?
• Crystal structure . CORRECT ANSWER: What is another term for crystal lattice?
• Type Ia . CORRECT ANSWER: What type are most natural diamonds?
• Cleavage . CORRECT ANSWER: What is a smooth, flat break in a crystal parallel
to a cleavage plane?
• Macle . CORRECT ANSWER: What is a flat, triangular, twinned diamond crystal?
, • Intrinsic defect and extrinsic defects . CORRECT ANSWER: What types of point
defects are found in diamonds?
• Color center . CORRECT ANSWER: What influences light absorption, resulting in
bodycolor?
• Hydrogen-related defects . CORRECT ANSWER: What trace element can cause a
violet color in diamonds?
• Lower . CORRECT ANSWER: How does the energy emitted by a gem compare to
the energy it absorbs?
• White light . CORRECT ANSWER: What type of light combines all the colors in
the visible spectrum?
• Nitrogen defects . CORRECT ANSWER: What is the most common cause of
yellow color in diamonds?
• Cutting . CORRECT ANSWER: What controls light path length within a diamond?
• Luster . CORRECT ANSWER: What term describes a gemstone's surface in
reflected light?
• Fire . CORRECT ANSWER: What describes the flashes of spectral colors seen in a
polished diamond?
#2 | Newest Questions and Answers | Updated
2026 | Complete Review
• Color . CORRECT ANSWER: How are gem-quality rough diamonds sorted?
• Baby Boomers . CORRECT ANSWER: What generation was first to connect with
diamonds as a representation of lifetime commitment?
• India . CORRECT ANSWER: Where did the diamond industry first start?
• Single-channel marketing . CORRECT ANSWER: What describes the concept of
centrally controlled supply, purchase, promotion, and sales of rough diamonds?
• Lower mantle . CORRECT ANSWER: What mantle layer is most dense?
• Will turn into graphite . CORRECT ANSWER: What happens to diamond if
lamproite stalls in the continental crust?
• When a continental and oceanic plate collide . CORRECT ANSWER: When does
subduction occur?
• High heat and high pressure . CORRECT ANSWER: How are metamorphic rocks
formed?
• CLIPPIR diamonds, blue diamonds, Brazil's Junia diamond . CORRECT ANSWER:
What is an example of a superdeep diamond?
,• A good sign that a pipe is nearby . CORRECT ANSWER: What might black spinel
in a mineral sample indicate?
• Robotic/automated crawlers . CORRECT ANSWER: What equipment might
offshore deep-sea diamond mining use?
• Primary deposits . CORRECT ANSWER: What deposit type produces most
diamonds mined today?
• Character sampling . CORRECT ANSWER: What type of sampling gives an initial
idea of diamond quality for a deposit?
• Brazil . CORRECT ANSWER: Where are rocks and geological structures similar to
Africa found due to ancient connections?
• Crystal structure . CORRECT ANSWER: What is another term for crystal lattice?
• Type Ia . CORRECT ANSWER: What type are most natural diamonds?
• Cleavage . CORRECT ANSWER: What is a smooth, flat break in a crystal parallel
to a cleavage plane?
• Macle . CORRECT ANSWER: What is a flat, triangular, twinned diamond crystal?
, • Intrinsic defect and extrinsic defects . CORRECT ANSWER: What types of point
defects are found in diamonds?
• Color center . CORRECT ANSWER: What influences light absorption, resulting in
bodycolor?
• Hydrogen-related defects . CORRECT ANSWER: What trace element can cause a
violet color in diamonds?
• Lower . CORRECT ANSWER: How does the energy emitted by a gem compare to
the energy it absorbs?
• White light . CORRECT ANSWER: What type of light combines all the colors in
the visible spectrum?
• Nitrogen defects . CORRECT ANSWER: What is the most common cause of
yellow color in diamonds?
• Cutting . CORRECT ANSWER: What controls light path length within a diamond?
• Luster . CORRECT ANSWER: What term describes a gemstone's surface in
reflected light?
• Fire . CORRECT ANSWER: What describes the flashes of spectral colors seen in a
polished diamond?
